Someday there will be a proper writeup, and probably a video. For now, a placeholder: an archived message from an Amiga BBS in which Joe Smith explains how he got a Sony KV-25XBR talking to an Amiga, after discovering that nobody at any computer store, any Sony dealer, or Sony customer service knew where to find the cable.
He bought the service manual, decided the official PX-34 connector was overpriced and the SMK-0001 cable a gamble, and wired up his own breakout box instead: a 9-pin Amiga video connector, six RCA jacks, and two switches for sync-on-green and TV audio. The full 34-pin and 9-pin pinouts follow, along with the reference links he gathered.